ICARUS Chamber Experiment: 2014 FIXCIT Study_20140123_ISOPRENE/OZONE_Hydroxyl radical_No Seed_Isoprene + OH + O3, low NO, 50% humidity, no seeds

Goals: This experiment is designed to be easily compared to our dry no-scavenger isoprene ozonolysis experiment (on January 6th), with the only change in conditions being the humidity (50% RH instead of 3-4%). Our main goal is to see how the products of humid ozonolysis compare with those of dry ozonolysis. The hot, wet conditions at the end may also help with ongoing investigation of GTHOS interference.Summary: The experiment went as planned; initial conditions all matched the values we were aiming for, with 601 ppbv of ozone, 53% RH, and approximately 100 ppbv of isoprene at 25 degrees C. Ozonolysis proceeded rapidly, with the CF3O- CIMS observing the usual ozonolysis products (e.g. HMHP), and as we did not use an OH scavenger, the CIMS saw evidence of ISOPOOH and IEPOX formation as well. At the end, the temperature was ramped to 45C, during which a number of ozonolysis product signals increased and GTHOS was able to observe the temperature-dependence of interferences.Organization: 2014 FIXCIT Study Lab Affiliation: California Institute of Technology Chamber: Seinfeld chambersExperiment Category: Gas phase chemical reaction Oxidant: Hydroxyl radical Reactants: ISOPRENE, OZONE Reaction Type: Photooxidation Relative Humidity: 50 Temperature: 25 Pressure: 750 Torr